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Mathematics 2020, 9, 50 18 of 30 Mathematics 2020, 8, x FOR PEER REVIEW 19 of 34 Figure 19. Mach number distribution (a) and pressure gradient (b) at design point (N = 40,000 rpm, PR = 6.9). Figure 20 shows the blade loading. As the enclosed area by the pressure and suction surfaces increases, the turbine produces higher power output (net torque). At the three profiles, blade loading is uniform in the pressure and suction surfaces. The lower pressure values in the suction surface Ficgourrree1s9p.oMndacthontuhmebloercadtiisotrnibouftitohne(tah)raonadt,pwrehsseurreetghreadaireenat (ibs)thatedleoswigenstpoaindt (sNpe=e4d0,i0s0t0hrepmhi,gPhRes=t.6.9). Figure 19. Mach number distribution (a) and pressure gradient (b) at design point (N = 40,000 rpm, PR = 6.9). Figure 20 shows the blade loading. As the enclosed area by the pressure and suction surfaces increases, the turbine produces higher power output (net torque). At the three profiles, blade loading is uniform in the pressure and suction surfaces. The lower pressure values in the suction surface correspond to the location of the throat, where the area is the lowest and speed is the highest. Figure 20. Blade loading through the rotor blades. Figure 20. Blade loading through the rotor blades. Figure 20 shows the blade loading. As the enclosed area by the pressure and suction Flow recirculation is a common phenomenon in ORC turbines due to the high loading on the surfaces increases, the turbine produces higher power output (net torque). At the three turbine blades. Figpurorefil2e1s,pbolardtreaylosadthinegflioswunsitfroeramilnintehsetphreosusguhretahnedtusurbcitnioensstuagrfea.cTesh.eTfhlueildowfleorwpsressure smoothly,andthevvaeluloecsitiynitshehosumcotigoennsoursflaycedicsotrribesupteodndaltontghethleocbaltaidonewofithoeuthtraonayt,fwlohwerrevtheersarlesaisthe lowest and speed is the highest. at a span of 90%. The flow is smooth at the leading edge at a span of 50%, signifying that the incidence Flow recirculation is a common phenomenon in ORC turbines due to the high loading angle at the rotor leading edge is optimum. However, flow recirculation is observed downstream of Figure 20. Blade loading through the rotor blades. on the turbine blades. Figure 21 portrays the flow streamlines through the turbine stage. the rotor blades at the suction side, resulting in a moderate level of diffusion at this area. Such flow The fluid flows smoothly, and the velocity is homogenously distributed along the blade recirculation occurs due to the difference between the actual and idealised flows in the blade passage. Flow recirculation is a common phenomenon in ORC turbines due to the high loading on the without any flow reversals at a span of 90%. The flow is smooth at the leading edge at The fluid velocities in the end-wall boundary layers are lower than those of the mainstream, thereby turbine blades. Figure 21 portrays the flow streamlines through the turbine stage. The fluid flows a span of 50%, signifying that the incidence angle at the rotor leading edge is optimum. causing the fluid to turn sharply and resulting in flow vortices. This indicates that this part of the smoothly, and the velocity is homogenously distributed along the blade without any flow reversals However, flow recirculation is observed downstream of the rotor blades at the suction side, blade needs to be further optimized. at a span of 90%. The flow is smooth at the leading edge at a span of 50%, signifying that the incidence resulting in a moderate level of diffusion at this area. Such flow recirculation occurs due angle at the rotor leadtointghedgifefeisreonpcteimbeutmw.eHenowthevaecr,tuflaolwanrdecidrceualaistieodnflisowobssienrvthede bdloawdensptraesasmageo.f The fluid the rotor blades at thveesluoctitioiens sinidteh,eresnudl-twinagllinboaumndoadreyrlaatyeelresvaerleolfodwifefrutshioan tahtotsheisoafrtehae.mSuacinhsftlroewam, thereby causing the fluid to turn sharply and resulting in flow vortices. This indicates that this part recirculation occurs due to the difference between the actual and idealised flows in the blade passage. of the blade needs to be further optimized. The fluid velocities in the end-wall boundary layers are lower than those of the mainstream, thereby causing the fluid to turn sharply and resulting in flow vortices. This indicates that this part of the blade needs to be further optimized.PDF Image | Generation of 3D Turbine Blades for Automotive ORC
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